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    <h5>Dimension class</h5>
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      <div><h1><span class="kind-constructor">Dimension.em</span> constructor</h1></div>

    <section class="multi-line-signature">
      
      <span class="name ">Dimension.em</span>(<wbr><span class="parameter" id="em-param-_value"><span class="type-annotation"><a href="dart-core/num-class.html">num</a></span> <span class="parameter-name">_value</span></span>)
    </section>

    <section class="desc markdown">
      <p>Set this CSS Dimension to the specified number of ems.</p>
<p>1em is equal to the current font size. (So 2ems is equal to double the font
size). This is useful for producing website layouts that scale nicely with
the user's desired font size.</p>
    </section>
    
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      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">Dimension.em(this._value) : _unit = &#39;em&#39;;</code></pre>
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